Abstract: An MPEG decoder IC in a DVD reproduction apparatus decodes update software read from a CD-ROM, and a transmission signal conversion IC transmits the decoded update software to a television receiver via data lines, utilizing InfoFrames in supplemental data. A microprocessor in the DVD reproduction apparatus indicates a software update to a microprocessor in the television receiver. Software for the microprocessor is stored in a memory of the television receiver. The microprocessor updates the software in the memory using the update software received by a reception signal conversion IC.

Abstract: An antitheft system is provided for an electronic apparatus including a television receiver and a DVD recorder connected via an apparatus control line. The DVD recorder includes a non-volatile memory for previously storing a password. The television receiver includes a non-volatile memory for previously storing the password and a controller. The controller requests the DVD recorder to transmit the password stored in the non-volatile memory when the television receiver is activated or started up, and receives the password from the DVD recorder. The controller further compares the received password with the password stored in the non-volatile memory, and starts an operation of the television receiver when the passwords coincide with each other.

Abstract: An MPEG decoder IC in a DVD reproduction apparatus decodes update software read from a CD-ROM, and a transmission signal conversion IC transmits the decoded update software to a television receiver via data lines, utilizing InfoFrames in supplemental data. A microprocessor in the DVD reproduction apparatus indicates a software update to a microprocessor in the television receiver. Software for the microprocessor is stored in a memory of the television receiver. The microprocessor updates the software in the memory using the update software received by a reception signal conversion IC.

Abstract: A remote-control signal receiver includes an input apparatus to input remote-control signals consisting of data trains repeated at a predetermined frequency, a data incorporating apparatus by which the remote control data derived from the remote-control signal is incorporated into a micro-computer by using the input apparatus, a setting apparatus by which the blank period between the data trains of the remote-control signal incorporated by using the input apparatus is set, and a limiting apparatus to limit the data incorporation period.

Abstract: A video switching circuit is capable of switching between a Y/C separated video signal and a composite video signal. The video switching circuit includes a first and a second video input terminals. The Y/C separated video signal is inputted to said first video input terminal and plural composite video signals are inputted to the second video input terminal when these two types of video signal inputs are required. The circuit is equipped with a first and a second selector. One of the plural composite video signals inputted to the second video input is selected by the first selector. The selected composite video signal is separated into luminance and chrominance signals by a Y/C separator. As a result, the output of the Y/C separator and the signal inputted by the first video input are similar. Thus, these two signals can be alternatively switched by the second selector according to the control signal given by an appropriate controller.